The term B2C stands for business-to-consumer. It means that a company sells products to consumers. Companies that fall under the name Business-to-Consumer are often retailers such as Walmart, MediaMarkt or H&M. Web stores such as Wehkamp also fall under this.
Within companies, the term B2C is often used to indicate a department. Companies such as Canon or Phillips make both consumer products and products for companies (such as large scanners or printers). The consumer products department is then referred to as B2C. However, they are not B2C companies. The customers of Phillips or Canon are the retailers, so it is B2B.